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    Section 6.0Fire Protection

    Structural steelwork

    Product:Knauf FireboardFp01

    Small cavity barriers

    Product: Earthwool Cavity Barrier

    Mezzanine floors

    Product:Rocksilk FireTech Slab

    Fp03

    Fp04

    Structural steelwork

    Product:Rocksilk FireTech Slab

    Fp02

    Large cavity barriers

    Product:Rocksilk Smoke and FireBarrier

    Fp05

    Refurbishment of timber

    separating/internal floor

    Product:Earthwool Flexible SlabFp06

    Steel Duct Encasement

    Product:Rocksilk Pyroduct Slab

    Fp07

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    Fire Protection6.1

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    Fire protection of structural steelFire protection design

    Can be installed prior to the building being

    sealed and made watertight, in all

    temperature and humidity conditions thisis in contrast to paint and sprays which are

    often restricted by normal UK winter

    conditions, causing potential delay to

    site programs

    Are fast, clean, and dry to install, with

    negligible dust levels, allowing other trades

    to work in close proximity

    Are quick and easy to check (by visual

    inspection) that all relevant areas have

    been protected

    Are fully compatible with drylining systems

    and allow easy integration with partitioning

    schemes

    Fire protectionAny steel section which is an element of

    structure and is deemed by any of the following

    regulations to require fire resistance can be

    protected with a fire protection system of dense

    rock mineral wool slabs or fibre reinforced

    gypsum based boards.

    1. The Building Regulations (England and

    Wales) Approved Document B (Fire Safety)

    Volumes 1 and 2 (2006)

    2. The Building (Scotland) Regulations,

    Technical Booklets, Section 2, 2011

    3. The Building Regulations (Northern Ireland)

    Technical Booklet E, 2005

    4. The Building Regulations (Republic of Ireland)

    Technical Guidance Document B (2006)

    Structural steel requires fire protection because

    it loses structural strength at temperatures that

    can be rapidly reached in a building fire. Thiswill consequently have a negative impact on the

    structural integrity of the building. Protecting the

    structural steel from the heat of a fire will delay

    the onset of this loss of strength and the possible

    collapse of the building. This is essential

    because it allows extra time for both the

    occupants of the building to escape and fire

    services to tackle the fire. It could also prevent

    the actual collapse of the building minimising

    insurance losses. Building Regulations covering

    fire safety are concerned with the preservation

    of life.

    With the increasing use of structural steel inconstruction, designers need fire protection

    solutions that provide a combination of fast

    installation and cost-effectiveness whilst

    achieving the desired finish.

    Whatever the application Knauf Insulation has

    a range of board products and systems to cater

    for any project.

    When used for the fire protection of structural

    steelwork, board systems offer several

    compelling advantages over site applied paint

    and spray coating systems.

    Board systems:

    Are manufactured to factory tolerances this

    enables the specifier to be certain that the

    correct thickness of fire protection is being

    applied, by simply checking the thickness of

    materials supplied

    5. Loss Prevention Council Code of Practice for

    Construction of Buildings

    Steel sections can include universal beams,

    columns and joists (plain and castellated),

    structural and rolled tees, angles, channels and

    round, square or rectangular hollow sections.

    BenefitsBoth rock mineral wool slabs and fibre

    reinforced gypsum boards offer a number of

    advantages for the fire protection of structural

    steelwork that make them ideal for fast track

    projects.

    Rock mineral wool

    Lightweight product at less than half the

    weight of calcium silicate slabs rockmineral wool fire protection boards are easy

    to handle and fit on site par ticularly for

    overhead work

    Ease of cutting and fixing: Rock mineral wool

    slabs are easy to cut with either a saw or a

    sharp knife, furthermore there are four fixing

    methods, all involve square edge butt joints

    between the boards which enables a fast and

    simple system to be installed without delaying

    other trades and activities

    Fibre reinforced gypsum

    Smooth surface only requires decorative

    finishes for completion Robust and impact resistant ideal for

    columns and all exposed surfaces

    Easy to cut to size can be scored and

    snapped to speed up cutting and reduce

    dust levels

    Knauf Insulation are members of

    the Association for Specialist Fire

    Protection, and our fire protection

    products are listed in the Yellow

    Book, which presents economical

    methods for the fire protection of

    structural steelwork to provide

    compliance with Building

    Regulations

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    6.

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    Fire protectionSolution optimiser and pathfinder

    Fire protection

    Period of fire resistance(mins)

    Knauf Insulation solution

    Mezzanine floorsProduct:Rocksilk FireTech Slab

    See page: 280

    0 mins 30 mins 60 mins 90 mins 120 mins 150 mins 180 mins 210 mins 240 mins

    Fp03

    Key

    Find online. Visit knaufinsulation.co.uk and key in construction code to find the

    most up to date information on your chosen solution.Pb01

    Fp04

    Large cavity barriersProduct:Rocksilk Smoke and Fire Barrier

    See page: 286

    Fp05

    Refurbishment of timber separating/internal floorProduct:Earthwool Flexible Slab

    See page: 292

    Fp06

    Steel Duct EncasementProduct:Rocksilk Pyroduct Slab

    See page: 294

    Fp07

    Structural steelworkProduct:Rocksilk FireTech Slab

    See page: 274

    Structural steelworkProduct:Knauf Fireboard

    See page: 268

    Fp01

    Fp02

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    Fire protectionStructural steelwork

    Knauf Fireboard

    Typical constructionKnauf Fireboard is used in frameless

    encasements. The product has been specially

    developed to accept direct edge fixings.

    Casings consist of Knauf Fireboard screwed or

    stapled to itself at abutting corners.

    For steelwork encased on all four sides, Knauf

    Fireboard is fixed at each corner directly

    through the material, independent of the columnor beam. For partial encasement, involving wall

    or ceiling abutments, Knauf Fireboard is fixed to

    light gauge steel angles.

    Knauf Insulation recommend the use of Knauf

    Drywall Screws, essential for fast construction,

    solid fixing and tightly closed edge joints.

    ProductsKnauf Fireboardis a gypsum based board

    specially developed for high performance lining

    and encasement, providing up to two hours of

    fire protection.

    Knauf Fireboard has a high quality white

    smooth surface finish ideally suited as a self

    finish. Its surface allows direct decoration with

    most paint finishes or it can be plastered*.

    Knauf Drywall Screwsare gold passivated

    screws with spoon tips and hi-low threads.

    Knauf Fireboard can also be installed using

    proprietary staples.

    *Consult plaster manufacturer prior to application of plasterfinish.

    Fp01 Quick and easy to install

    Dry fix system providing up to 2hours fire protection

    Combined fire protection andaesthetic finish

    Knauf Fireboard

    Non-combustible with a Euroclass

    A1 reaction to fire rating

    Zero Ozone Depletion Potential (ODP)

    Zero Global Warming Potential (GWP)

    Edge fix the boards usingeither Knauf Drywall Screwsat maximum 150mm centresor proprietary staples at120mm centres.

    Knauf Fireboard

    Knauf Drywall Screws at maximum100mm centres into backing strips

    Abutment angles: light gaugesteel angle provides support atsoffit and wall junctions. Fixed toadjoining soffit or section flange.

    REFURBNEW BUILD

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    Typical specificationKnauf Fireboard, ...mm thick, to be used to

    provide fire protection to structural steelwork.

    It is to be installed on beam*/column* as a

    complete 4 sided*/3 sided*/2 sided*

    encasement (*specifiers choice) to provide

    ......minutes fire protection as detailed in the

    Installation section.

    Alternatively, consult the NationalBuilding Specifications, Standard

    version clause/clauses

    K10/265

    Knauf Insulation specification clauses can be

    downloaded from knaufinsulation.co.uk/nbs

    PerformanceFire performance

    The system can provide up to 2 hours fire

    protection. For precise calculation of fire

    protection periods, please contact Knauf

    Insulation Technical Advice and Support Centre.

    Knauf Fireboard is non-combustible

    to BS 476: Part 4: 1970 (1984) and Class 1

    surface spread of flame to BS 476: Part 7:1997. Knauf Fireboard complies with the Class

    0 requirements of the Building Regulations

    when tested to BS 476: Part 6: 1989 and Part

    7: 1997 and with the limited combustibility

    described in the Building Regulations.

    Humidity

    Constant humidity over 95% or subjection to

    continuous water will reduce the serviceability

    of the boards.

    Operating temperatures

    Continuous long term exposure to temperatures

    over 50C can induce a change of state which

    would reduce the physical performance and

    serviceability of the boards.

    Health and safety

    Knauf Fireboard must be installed with care.

    Ensure adequate ventilation during installation,particularly when cutting boards. Avoid harsh

    body contact with sharp cut edges of metal

    components. Refer to Knauf Insulation Material

    Safety Data Sheets and to the Health and Safety

    Executive publications.

    For Hp/A tables please visit

    knaufinsulation.co.uk

    Knauf Fireboard casing

    Stagger joints by 300mm minimum

    Direct edge-fixing with Knauf DrywallScrews at 200mm centres orproprietary staples at 120mm centres

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    1 2 Hold in place thefirst 2 boards

    with clamps.

    3 After measuring the

    size of the remaining

    2 sides, cut another

    two to the depth of

    the column plus

    twice the thickness

    of the board.

    4 Apply the remaining

    boards, adjusting

    the length of

    adjoining boards to

    ensure that board

    joints are staggered

    by at least 300mm.

    5Edge-fix the boardsusing either selfdrilling Knauf

    Fireboard Gripper

    Screws at 200mm

    centres or proprietary

    staples at 120mm

    centres. KnaufFireboard Gripper

    Screws should

    penetrate into the

    casing by at least

    30mm

    Installation sequence

    Fire protectionInstallation of column system

    Partial column encasement

    Assuming a typical three-sided encasement

    where one of the column flanges straddles a

    wall, follow the same procedure as outlined

    for four-sided encasement with the following

    differences:

    Fix 25 x 25mm light gauge steel angles,

    in continuous lengths, to either the abutting

    wall face or the inner flange of the column.

    Use appropriate proprietary fixings at

    600mm centres

    Double layer application

    Install the first layer as described for either full

    or partial encasement. Secure the second layer

    to the first with fixings spaced as for the first

    layer but avoid coincident fixing positions.

    It is good practice that board joints are

    staggered as with the first layer between

    adjoining boards and also between the twolayers. In the case of structural steelwork,

    double layer encasement will obviate the need

    for joint backing strips.

    Installation

    Steelwork encasements must be installed in full

    accordance with Knauf Insulations

    recommendations and in compliance with

    BS 8212: 1995 and BS 8000: Part 8: 1994.

    The installation procedures outlined here relate

    to normal single layer applications.

    Knauf Drywall Screws

    Knauf Drywall Screws should penetrate into the

    casing by at least 30mm.

    Four-sided column encasement

    Cut two boards to the width of the column

    flange. Cut another two to the depth of the

    column plus twice the thickness of the board

    Adjust the length of adjoining boards to

    ensure that board joints are staggered by at

    least 300mm

    Edge-fix the boards using either Knauf

    Drywall Screws at 200mm centres or

    proprietary staples at 120mm centres

    Cut two boards to

    the width of the

    column flange.

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    Fire protectionInstallation of beam system

    Beam encasement

    Assuming a typical three-sided encasement,

    where a beam is exposed directly below a level

    soffit, fix light gauge steel angles to either the

    adjoining soffit or the top flange of the beam.

    Install continuous lengths of 25 x 25mm angle

    using appropriate proprietary fixings at 600mm

    centres.

    Fix further lengths of 25 x 25mm angle at any

    end abutment

    Cut two boards to the depth of the section

    plus twice the thickness of the board plus

    l0mm. Screw-fix these to the angles at

    150mm centres with 35mm Knauf Drywall

    Screws

    Cut a soffit board to the width of the steel

    flange. The length of this board must differ

    from the side boards to ensure adjacent

    board joints are staggered by at least

    300mm. Edge-fix this horizontal board to thetwo vertical boards using either self-drilling

    Knauf Drywall Screws at 150mm centres or

    staples at 120mm centres

    Cut board off-cuts 100mm wide as joint

    backing strips. Fit these, half-lapped, behind

    all butt joints at the sides and soffit of the

    beam fixed with Knauf Drywall Screws at

    maximum 100mm centres

    Double layer application

    Install the first layer as described for either full

    or partial encasement. Secure the second layer

    to the first with fixings spaced as for the first

    layer but avoid coinciding fixing positions.

    It is good practice that board joints are

    staggered as with the first layer between

    adjoining boards and also between the two

    layers. In the case of structural steelwork,

    double layer encasement will obviate the need

    for joint backing strips.

    The second layer of boards across the webs are

    fixed to the angle attached to the upper flange

    using 55mm long Knauf Drywall Screws at

    150mm centres and the second layer across the

    bottom flange using Knauf Drywall Screws at

    Installation sequence

    1 Install continuous lengths of

    25 x 25mm angle using

    appropriate proprietary

    fixings at 600mm centres, fix

    further lengths of 25 x 25mm

    angle at any end abutment.

    2 Cut two boards to the depthof the section plus twice theboard thickness plus l0mm.

    Screw-fix these to the anglesat 150mm centres with35mm Knauf Drywall

    Screws.

    3 Cut a soffit board to the

    width of the steel flange.

    The length of this board must

    differ from the side boards to

    ensure adjacent board joints

    are staggered by at least

    300mm.

    Edge-fix horizontal board to

    the two vertical boards using

    either Knauf Fireboard

    Gripper Screws at 150mm

    centres or proprietary staples

    at 120mm centres.

    4 Cut board off-cuts 100mm

    wide as joint backing strips.

    Fit these, half lapped, behind

    all butt joints at the sides

    and soffit of the beam.

    Fix with Knauf FireboardGripper Screws at maximum100mm centres.

    6.

    1

    nominal 150mm centres, screw lengths should

    be equal to the thickness of the second layer,

    plus 30mm. Where two different thicknesses of

    Fireboard are applied, the thicker layer is

    installed first.

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    Fire protectionApplication details for beams

    25 x 25mm angle secured to top flangeof beam, or alternatively to soffit

    Beam with partition abutment

    Beam with wall abutment

    25 x 25mm angle secured to top flange ofbeam, or alternatively to soffit

    Knauf Drywall Screws at maximum100mm centres

    Fireboard casing

    Backing strip

    10mm gap

    Direct edge fixing with Knauf DrywallScrews at maximum 150mm centres orstaples at 120mm centres

    C-Stud partition with standardU-Channel head track

    Knauf Drywall Screws at maximum100mm centres

    Fireboard casing

    Direct edge fixing with KnaufFireboard Gripper Screws atmaximum 150mm centres orstaples at 120mm centres

    Continuous 25 x 25mm KnaufFireboard Angle secured to substrateusing appropriate fixings

    Masonry wall

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    Column with partition abutment

    Knauf C-Stud toggle-fixed to KnaufFireboard casing

    Knauf Wallboard not fixed to this C-Stud

    Direct edge fixing with Knauf DrywallScrews at maximum 200mm centres orstaples at 120mm centres

    Continuous 25 x 25mm KnaufFireboard angle at each corner

    Knauf Wallboard not fixed to this C-Stud

    Direct edge fixing with Knauf DrywallScrews at maximum 200mm centres orstaples at 120mm centres

    Column with wall lining abutment

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    Fire protectionStructural steelwork

    Rocksilk FireTech Slab

    Noggin of Rocksilk FireTech Slabor Rocksilk FireTech Dry Fix NogginSlab

    Rocksilk FireTech Slab

    InstallationRocksilk FireTech Slab can be used with four

    types of fixing methods for the fire protection of

    structural steelwork and each system has its own

    performance characteristics.

    Fixing methods:

    Dry Fix Noggin System

    Adhesive Noggin Fixing System Combination Fixing System

    Welded Pin Fixing System

    Typical constructionThe exposed surfaces of any steel section are

    fully enclosed in Rocksilk FireTech Slab, using

    any of the fixing systems shown on the following

    pages.

    Rocksilk FireTech Slab can be used to provide

    up to 4 hours fire protection to structural steel

    and cast iron columns, beams and trusses. Steel

    sections may include universal beams, columns

    and joists (plain and castellated), structural and

    rolled tees, angles, channels and round, square

    or rectangular hollow sections.

    ProductRocksilk FireTech Slabis a dense rock mineral

    wool slab. It is available unfaced or faced with

    a bright Class 0 reinforced aluminium foil, for

    applications above clean rooms, within air

    plenums, or for aesthetic purposes.

    Plaster manufacturers advice and guidance

    should be followed regarding pre-treatment of

    Rocksilk FireTech Slabs before application ofplaster finishes

    Rocksilk FireTech Dry Fix Noggin Slabis an ultra

    high density rock mineral wool slab used for the

    noggin in the Rocksilk FireTech Dry Fix Noggin

    System.

    Fp02 Flexible system with four installation

    methods

    Maintenance free, passive system

    Clean installation process withnegligible dust generation

    Rocksilk FireTech Slab

    Non-combustible with a Euroclass A1

    reaction to fire rating Zero Ozone Depletion Potential (ODP)

    Zero Global Warming Potential (GWP)

    Pig tail screws

    REFURB

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    Technical specificationRocksilk FireTech Slab, ...mm thick, to be

    used to provide fire protection to structural

    steelwork.

    It is to be installed using the dry fix noggin

    system*/adhesive noggin fixing system*/

    combination fixing system*/welded pin

    fixing system* (*specifiers choice) as

    detailed in the Installation section.

    Alternatively, consult the National

    Building Specifications, Standard

    version clause/clauses

    K11/885

    Knauf Insulation specification clauses can be

    downloaded from knaufinsulation.co.uk/nbs

    PerformanceFire performance

    Rocksilk FireTech Slab is classified as

    non-combustible to BS 476: Part 4:

    1970(1984), Class 1 surface spread of flame

    to BS 476: Part 7: 1997, and Class 0 to the

    Building Regulations. Rocksilk FireTech Slab is

    designed to provide up to 4 hours fire

    protection to structural steelwork, thereby

    satisfying the Building Regulations and

    insurance demands for periods of fire

    resistance.

    Durability

    Rocksilk FireTech Slab is rot proof, does not

    sustain vermin and will not encourage the

    growth of fungi, mould or bacteria.

    Rocksilk FireTech Slab is odourless and

    non-hygroscopic.

    Rocksilk FireTech Slab is non-wicking when

    tested to BS 2972: 1989: Section 12.When exposed to 90% relative humidity and

    20C, Rocksilk FireTech Slab absorbs less than

    0.004% of moisture.

    For Hp/A tables please visit

    knaufinsulation.co.uk

    Noggin of Rocksilk FireTech Slab orRocksilk FireTech Dry Fix NogginSlab

    Pig Tail Screws

    Rocksilk FireTech Slab

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    Fire protectionInstallation of Rocksilk FireTech Slab

    Adhesive Noggin Fixing SystemUp to 2 hours fire protection

    Attach web pieces to nogginswith pig tail screws at100mm centres.

    Dry Fix Noggin SystemUp to 2 hours fire protection

    Welded Pin Fixing SystemUp to 4 hours fire protection

    Combination Fixing SystemUp to 3 hours fire protection

    Attach web pieces tonoggins with pig tailscrews at 100mm centres.

    The use of a dense rock mineral wool slab

    requires no special vee cuts, drilling or

    sub-frames, making it fast and easy to install.

    Rock mineral wool slabs can be easily cut using

    hand or power tools.

    Note: Rocksilk FireTech Dry Fix Noggin Slab has a densityof 200 kg/m3.

    The Combination Fixing System

    Can be used to provide up to 2 hours fire

    protection to all sizes of structural steelwork,

    and up to 3 hours fire protection to steelwork

    with section factors (Hp/A) of up to 133m-1for

    columns and 143m-1for beams.

    The Welded Pin Fixing System

    Can be used to provide up to 3 hours fire

    protection to all sizes of structural steelwork,

    and up to 4 hours fire protection to steelwork

    with section factors (Hp/A) of up to 172m-1for

    columns and 184m-1for beams.

    If section factors are above 260m -1contact our

    Technical Advice and Support Centre.

    Alternative installation methodsThe Dry Fix Noggin System

    Is a fast and efficient friction fit noggin system

    that does not require adhesive. It can give up to

    2 hours fire protection to BS 476: Part 21.

    When installing 20, 25 and 30mm Rocksilk

    FireTech Slab, noggins should be cut from a

    30mm Rocksilk FireTech Dry Fix Noggin Slab.

    When greater thicknesses of Rocksilk FireTech

    Slab are used, the noggins are cut from a

    corresponding thickness of Rocksilk FireTech Dry

    Fix Noggin Slab.

    The Adhesive Noggin Fixing System

    Can be used to provide up to 2 hours fire

    protection to all sizes of structural steelwork.

    100mm wide noggins ofRocksilk FireTech Dry FixNoggin Slab friction fittedbetween the flanges.

    Attach flange pieces to webpieces using pig tail screwspositioned 25mm in fromeach end and at 150mmcentres.

    Attach flange pieces toweb pieces using pig tailscrews positioned 25mmin from each end and at150mm centres.

    100mm wide noggin ofRocksilk FireTech Slabglued into place usingsuitable adhesive

    Attach the Rocksilk FireTechSlab web pieces by impalingover the welded pins andsecuring in place with 38mmspring steel washers.

    Attach flange pieces to webpieces using pig tail screwsat 150mm centres.

    Adhesive should be used atthe joint between subsequentweb pieces.

    Attach the Rocksilk FireTechSlab web and flange piecesby impaling over the 3mmdiameter welded mild steelpins and securing in placewith 38mm spring steelwashers.

    Adhesive should be used atthe joint between subsequentweb pieces.

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    Adhesive noggin fixing systemNoggins are cut 100mm wide from 20mm thick

    Rocksilk FireTech Slab. They should be cut to a

    suitable length relative to the web size to give

    a tight compression fit.

    Noggins are glued top and bottom using a

    typical adhesive thickness of 0.5mm and friction

    fitted between the flanges at 600mm centres.

    The noggins should be installed in such a way

    that they are slightly 'proud' of the flange (by

    about 2mm) and such that they coincide with

    joints between the boards.

    It is preferable to leave the noggins in position

    for 4 hours to allow the adhesive to cure.

    However, where this is impractical Rocksilk

    FireTech Slab can still be fitted before the

    adhesive cures since the noggins are essentially

    friction fitted.

    For web depths greater than 500mm, T-shaped

    or solid noggins should be used, formed from

    Rocksilk FireTech Slab, and screwed together

    using pig tail screws.

    Attach web pieces to noggins using pig tail

    screws at 100mm centres

    Solid noggin formed from one or more pieces

    of Rocksilk FireTech Slab

    Greaterthan

    500mmFull

    depth

    100mm

    T-shaped noggin formed from two pieces of

    Rocksilk FireTech Slab joined at right angles

    using pig tail screws

    Insert noggins as described at 600mm

    centres and if practicable leave for 4 hours

    for adhesive to cure.

    Cut Rocksilk FireTech Slab to size as follows:

    Beams: flange pieces to dimension X, web

    pieces to dimension Y + t (t = thickness of

    board)

    Columns: flange pieces to dimension X,web pieces to dimension Y + 2t

    100mm

    Greater

    than

    500mm

    Y

    X

    Attach flange pieces to web pieces using pig

    tail screws positioned 25mm in from each

    end at 150mm centres.

    Note: For flanges greater than 400mm use welded pinand spring steel washers to provide extra retention ofthe flange piece of insulation. The welded pins shouldbe located along the centre line of the flange at 300mmcentres.

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    Fire protectionApplication details for beams

    Partition abutment using a noggin fixing system

    Wall abutment using a noggin fixing system

    Pig tail screws at maximum100mm centres

    Direct edge fixing with pig tail screws atmaximum 150mm centres

    Attach flange piece to web piece byimpaling over welded pins and securingthe board to board joint with pig tailscrews at 150mm centres. Spring steelwashers are used over the welded pins toretain the insulation, any excess pinlength being trimmed off

    Rocksilk FireTech Slab

    C-Stud partition with standard U-Channel

    head track

    Pigtail screws at maximum 100mm centres

    Attach flange piece to web piece by impalingover welded pins and securing the board toboard joint with pig tail screws at 150mmcentres. Spring steel washers are used overthe welded pins to retain the insulation, anyexcess pin length being trimmed off

    Direct edge fixing with pig tail screws atmaximum 150mm centres

    Rocksilk FireTech Slab

    Masonry wall

    Rocksilk FireTech noggin

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    6.

    1

    Column with wall lining abutment

    Column with partition abutment

    Adhesive detail

    The adhesive used for gluing Rocksilk FireTech

    Slabs should be a thixotropic paste type based

    on soluble solids of silicate and potassium

    mixed with clay or refractory mineral filler to an

    approximate ratio of 70:30 by weight.

    Steelwork should ideally be dry but the

    presence of condensation will merely prolong

    the cure time, not weaken the bond strength.

    Since only the top and bottom sur face of each

    noggin is glued with a typical adhesive

    thickness of 0.5mm, excellent rates of usage are

    achievable.Note: Steelwork should be clean and free from grease priorto the application of adhesive.

    * For further details contact our Technical Advice andSupport Centre.

    Rocksilk FireTech Slab

    Masonry wall

    Knauf Wallboard not fixed to this C-Stud

    Direct edge fixing with pig tail screws atmaximum 150mm centres

    Direct edge fixing with pig tail screws atmaximum 150mm centres

    Rocksilk FireTech Slab

    Knauf Wallboard not fixed to this C-Stud

    Pig tail screws

    The spirally wound or pig tail screws are

    made from 16 gauge galvanised wire and

    are available from stockists. A specification

    is available on request from our Technical

    Advice and Support Centre.

    The screws should be installed flush at 150mm

    centres on board to board joints and 100mm

    centres over noggins, using either power or

    hand tools. There is no need to countersink thescrew heads.

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    Fire protectionMezzanine floors

    Rocksilk FireTech Slab

    Simple, clean and quick to install Provides up to 3 hours fire resistance System covers section factors up to

    310 Hp/A - (A/V)

    Rocksilk FireTech Slab

    Non-combustible with a Euroclass A1reaction to fire rating

    Zero Ozone Depletion Potential (ODP)

    Zero Global Warming Potential (GWP)

    PerformanceFire performance

    Rocksilk FireTech Slab is classified as

    non-combustible to BS 476: Part 4: 1970

    (1984). Class 1 Surface Spread of Flame to BS

    476: Part 7:1977, and Class O to the

    Building Regulations. Rocksilk FireTech Slab is

    designed to provide up to 3 hours fire

    protection to the mezzanine floor column

    support system, thereby satisfying the current

    Building Regulations and insurance industry fire

    resistance performance standards.

    Performance

    Rocksilk FireTech Slab is rot proof, does notsustain vermin, will not encourage the growth of

    fungi, mould or bacteria and is odourless and

    non-hygroscopic.

    ProductRocksilk FireTech Slab is a dense rock mineral

    wool slab specifically designed for the fire

    protection of structural steelwork.

    Typical construction

    The exposed surface of a steel section is fully

    enclosed in Rocksilk FireTech Slab, using a

    metal clip, snap-lock system.

    Installation

    The column case is pre-fabricated to suit the

    specific beam or column. It is lined with Rocksilk

    Firetech Slab which is pre-bonded to the steel

    skin. Note that no adhesive is applied to the

    joints between individual slabs. The columncase is made of galvanized or PVC coated steel

    minimum 0.7mm thick. For columns, the casing

    is normally supplied in two pieces with the

    closing face fixed with snap-lock joints.

    Three-sided encasements are secured at 300mm

    centres to continuous galvanized steel angles,

    or the flange of the steel section, or to the wall

    or floor at 500mm nominal centres.

    Alternatively the casing may be secured using

    an integral lip on the casing.

    Fp03

    Rocksilk FireTech Slab

    REFURB

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    Technical specificationRocksilk FireTech Slab.mm thick, to be

    used to provide fire protection to structural

    steelwork in a mezzanine floor system.

    Alternatively, consult the National

    Building Specifications, Standard

    version clause/clauses

    K11/885

    Knauf Insulation specification clauses can bedownloaded from knaufinsulation.co.uk/nbs

    Table 1 - Mezzanine floors

    Time - mins Board Thickness (mm) Hp/A

    60 20 224

    25 260

    30 310

    35 310

    40 310

    45 310

    90 20 91

    25 115

    30 139

    35 165

    40 190

    45 217

    50 244

    55 260

    60 270

    65 310

    120 20 57

    25 72

    30 87

    35 102

    40 117

    45 133

    50 149

    55 165

    60 181

    65 198

    180 30 49

    35 58

    40 66

    45 75

    50 84

    55 92

    60 101

    65 110

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    Cavity barriersCavity barrier design

    Design considerationsEvery building must be designed and

    constructed in such a way that in the event of

    an outbreak of fire within the building, the

    unseen spread of fire and smoke within

    concealed cavities in its structure and fabric is

    inhibited. The Building Regulations require

    cavity barriers to sub-divide voids if they extend

    beyond certain dimensions.

    In addition cavity barriers are also required tobe placed above fire resisting partitions. Both

    glass and rock mineral wool products are ideal

    to act as cavity barriers due to their inherent

    non-combustibility.

    In the case of fire stopping minor imperfections

    of fit between construction elements or

    components, it is acceptable to seal small gaps

    with unfaced glass or rock mineral wool

    products. However, for specific periods of fire

    resistance in small and large voids (as required

    by the Building Regulations) it is necessary to

    use specific products that have been tested and

    assessed to offer the required performancewhen installed in a specific way, if necessary,

    using specific fixing components.

    Concealed cavitiesFire and smoke spread in concealed spaces is

    particularly hazardous because fire can spread

    quickly throughout a building and remain

    undetected by the occupants of the building.

    Cavity barriers are used to sub divide

    cavities and so prevent smoke and flame from

    by-passing fire-resisting walls and partitions.

    The maximum distance between barriers must

    be appropriate to the location of each cavity.Also, due consideration must be given to the

    class of surface exposed within the cavity.

    Cavity barriers should achieve at least 30

    minutes fire resistance, providing a minimum of

    30 minutes integrity and 15 minutes insulation.

    Detailed requirements are complex. For full

    details about the position and spacing of cavity

    fire barriers refer to the relevant sections of the

    appropriate Building Regulations.

    Small cavity barriersSmall voids include the cavities in external walls

    and voids beneath raised access floors. Largervoids include the spaces between suspended

    ceilings and soffits or roofs.

    In cavities in external walls the resilient

    properties of glass mineral wool mean that it

    can be compression fitted, between the outer

    leaf and the inner leaf or frame. The non-

    combustible nature of glass mineral wool allows

    it to resist the effects of fire, enabling it to

    remain in place during the fire and effectively

    block the transfer of fire through the cavity.

    Large cavity barriersIn England, Wales and Northern Ireland, all

    cavity barriers should be constructed to provide

    at least 30 minutes fire resistance and 15

    minutes insulation. In Scotland large cavity

    barriers, which are defined as being greater

    than 1m x 1m in size, must provide the same.

    Fixing systemsAny product used for fire protection can only be

    considered to be offering a specific period of

    fire protection when it is installed in the manner

    specified in the appropriate fire test report. This

    includes the specification of all associated

    fixings and supporting frame work.

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    DefinitionsThe following definitions are taken from

    Approved Document B (Fire safety) - Volume

    2: Buildings other than dwellinghouses

    (2006)

    Cavity barrier

    A construction, other than smoke curtain,provided to close a concealed space against

    penetration of smoke or flame, or provided to

    restrict the movement of smoke or flame

    within such a space.

    Fire stop

    Seal provided to close an imperfection of

    fit or design tolerance between elements or

    components, to restrict the passage of fire

    or smoke. Any unfaced glass or rock mineral

    product can be used as a fire stop.

    50mm RocksilkSmoke and FireBarrier 50mm Rocksilk

    Smoke andFire Barrier

    50mm cavity

    Suspended ceilingof 12.5mm plasterboard

    30 minutes fire resistance 1 hour fire resistance

    Photograph courtesy of Henley Building Systems

    Small cavity barriers - to be deleted

    Large cavity barriersProduct:Rocksilk Smoke and Fire BarrierSee page: 286

    Fp04

    Fp05

    Period of fire resistance(mins)

    Knauf Insulation solution 0 mins 30 mins 60 mins 90 mins 120 mins 150 mins 180 mins 210 mins 240 mins

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    Meets Building Regulationrequirements for fire, acoustics andparty wall bypass applications

    Simple, clean and quick to install

    Colour coded for easy identification

    Earthwool Cavity Barrier

    Non-combustible with a Euroclass A1

    reaction to fire rating A+ Generic BRE Green Guide rating

    Zero Ozone Depletion Potential (ODP)

    Zero Global Warming Potential (GWP)

    Fire protectionSmall cavity barriers

    Earthwool Cavity Barrier

    InstallationIn vertical applications, both flanges of the

    Earthwool Cavity Barrier should be fixed to the

    inner leaf.

    In horizontal applications, the top flange of

    the polythene sleeve should be fixed to the

    inner leaf.

    All joints and intersections of Earthwool Cavity

    Barriers should be closely butted.

    Typical constructionEarthwool Cavity Barriers are engineered to

    prevent the spread of smoke and fire through

    walls, floors and cavities in timber frame, metal

    frame and masonry buildings.

    They are also suitable for reducing flanking

    noise transmission in these concealed cavities.

    The use of the correct size of Ear thwool Cavity

    Barrier is essential. Earthwool Cavity Barriersare designed to compress to a tight fit in

    cavities and in the event of fire breaking into

    the cavity, Earthwool Cavity Barriers do not rely

    on the polythene flanges to hold them in place,

    but on their compression between the inner and

    outer leaf.

    It is, therefore, essential to specify the Earthwool

    Cavity Barrier by reference to the actual

    constructed cavity width.

    ProductEarthwool Cavity Barrieris manufactured from

    a continuous length of non-combustible glass

    mineral wool which is compressed within a

    resilient polythene sleeve incorporating two

    flanges designed for ease of fixing.

    The polythene sleeve is colour coded to suit a

    variety of cavity widths from 50mm to 100mm

    and eliminates the need for weather protectionduring installation.

    The barriers are 1200mm long and can be

    used in both vertical and horizontal

    applications, and are available in two standard

    widths (100mm and 300mm). 100mm barriers

    are used for normal fire stopping and noise

    reduction applications. 300mm barriers are

    used where higher performance levels are

    specified and at party wall/external wall cavity

    junctions.

    Fp04

    Earthwool Cavity Barrier stapled through top flange tosheathing to fully fill the cavity

    Brick outer leaf

    NEW BUILD

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    Technical specificationTimber frame construction

    Earthwool Cavity Barrier 100mm*/300mm*

    wide, coloured yellow*/ blue*/white* to be

    friction fitted in the positions shown on the

    drawings. Earthwool Cavity Barrier to fully fill

    the depth of the cavity.

    Polythene flanges to be stapled to the

    timber*/sheathing board* to hold the cavity

    barrier in place.

    All joints and intersections of Earthwool

    Cavity Barriers should be closely butted

    together.

    Alternatively, consult the National

    Building Specifications, Standard

    version clause/clauses

    P10/420

    Knauf Insulation specification clauses can be

    downloaded from knaufinsulation.co.uk/nbs

    Masonry construction

    Earthwool Cavity Barrier 100mm*/ 300mm*wide, coloured yellow*/ blue*/white* to be

    friction fitted in the positions shown on

    the drawings.

    Earthwool Cavity Barrier to fully fill the depth

    of the cavity.

    All joints and intersections of Earthwool

    Cavity Barriers should be closely butted

    together.

    Alternatively, consult the National

    Building Specifications, Standard

    version clause/clauses

    P10/420

    Knauf Insulation specification clauses can be

    downloaded from knaufinsulation.co.uk/nbs

    PerformanceFire performance

    Earthwool Cavity Barriers are manufactured

    from glass mineral wool which has a Euroclass

    A1 rating when classified in accordance with

    BS EN 13501-1.

    Earthwool Cavity Barriers have been tested for

    fire resistance in accordance with BS 476: Par t

    8: 1972 and will provide 60 minutes stability,

    integrity and insulation.

    Acoustic performance

    Building Regulations require the use of a cavity

    closer to reduce flanking noise transmission

    along party wall cavities and external wall

    cavities in masonry and timber frame

    constructions.

    Earthwool Cavity Barriers meet the generic

    description for cavity closers and will therefore

    ensure compliance with Part E and Robust

    Details in timber frame and masonry wall

    constructions.

    Table 2 - Colour coding

    Cavity width (mm) Colour

    50-65 yellow

    66-80 blue

    81-100 white

    Typical junction with party wall

    300mm wide EarthwoolCavity Barrier - stapled tosheathing board eitherside of party wall

    Earthwool Timber FrameParty Wall Slab

    Earthwool FrameTherm

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    Fire protectionLarge cavity barrier

    Rocksilk Smoke and Fire Barrier

    Simple, clean and quick to install

    Provides both fire and acousticperformance

    Versatile, flexible and adaptablesystem

    Rocksilk Smoke and Fire Barrier

    Non-combustible with a Euroclass

    A1 reaction to fire rating Zero Ozone Depletion Potential (ODP)

    Zero Global Warming Potential (GWP)

    For one hour fire resistance

    Two layers of 50mm Rocksilk Smoke and Fire

    Barrier, separated by a 50mm air space,

    applied as a hanging curtain with wire meshto the outside, supported continuously from

    above and both sides, using the fixings listed in

    Table 3. At the base it is either lapped freely on

    to the back of a suspended ceiling, or fixed to a

    partition head.

    Use foil faced Rocksilk Smoke and Fire Barrier

    when the ceiling void is used as an air plenum.

    Installation

    See page 288 - 291 for installation details.

    See Table 3 for specification of fixings and

    supporting metalwork.

    Typical constructionFor half an hour fire resistance

    A single layer of 50mm Rocksilk Smoke and

    Fire Barrier, applied as a hanging curtain,

    supported continuously from above and bothsides, using the fixings listed in the Table 3.

    At the base Rocksilk Smoke and Fire Barrieris

    either lapped freely on to the back of a

    suspended ceiling or fixed to a partition head.

    Suitable for drops up to 7 metres.

    ProductRocksilk Smoke and Fire Barrieris made from

    rock mineral wool and formed into a flexible

    mattress faced on one side with galvanised

    wire mesh stitched in position.Rocksilk Smoke and Fire Barrier is also

    available foil faced on one or both sides.

    Rocksilk Smoke and Fire Barrier must be

    installed in accordance with the specifications

    detailed below and on the following pages. If

    these specifications are not strictly followed the

    installation cannot be deemed to offer any

    specific period of fire protection.

    Fixing components:

    Angle: Mild steel - 50mm x 50mm x 2mm or

    60mm x 40mm x 2mm

    Strip: Mild steel - 40mm x 2mm

    See Table 3 for suitable method of fixing angles

    and strips to substrate.

    Fp05

    Rocksilk Smoke andFire Barrier fixed to 50mmtimber spacer

    Metal angle fixed to soffit

    Rocksilk Smoke and Fire Barrier

    50mm airgap

    REFURB

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    Metal anglesfixed to soffit

    Rocksilk Smokeand Fire Barrier

    Rocksilk Smoke and Fire Barrierfixed to timber spacer

    Technical specificationHalf hour cavity barrier

    A single layer of 50mm Rocksilk Smoke and

    Fire Barrier (*foil faced) to be installed in the

    positions marked on the drawings, and fixed

    in accordance with the manufacturers

    recommendations. All joints either tightly

    butted, overlapped, or with edges returned,

    and stitched in a continuous spiral loop with

    1mm diameter galvanised lacing wire.(* delete as appropriate)

    One hour cavity barrier

    Two layers of 50mm Rocksilk Smoke and

    Fire Barrier (*foil faced), separated by a

    50mm air space to be installed in the

    positions marked on the drawings, and

    fixed in accordance with the manufacturers

    recommendations. All joints either tightly

    butted, overlapped, or with edges returned,

    and stitched in a continuous spiral loop with

    1mm diameter galvanised lacing wire.(* delete as appropriate)

    Alternatively, consult the National

    Building Specifications, Standard

    version clause/clauses

    K10/545

    Knauf Insulation specification clauses can be

    downloaded from knaufinsulation.co.uk/nbs

    PerformanceFire performance

    Rocksilk Smoke and Fire Barrier is made from

    rock mineral wool and is classified as non-

    combustible to BS 476: Part 4: 1970. RocksilkSmoke and Fire Barrier has a Class 1 Surface

    Spread of Flame to BS 476: Part 7: 1997 and

    is Class 0 to the Building Regulations.

    When subjected to full scale fire resistance tests

    to BS 476: Part 22: 1987, a system comprising

    one layer of 50mm Rocksilk Smoke and Fire

    Barrier, fixed by using the components and

    methods detailed on the following pages

    achieved 19 minutes insulation, and retained its

    integrity for 35 minutes, after which time the test

    was discontinued. 50mm Rocksilk Smoke and

    Fire Barrier thereby satisfies the criteria laid

    down in the Building Regulations for cavitybarriers, by exceeding the minimum

    requirement of 15 minutes insulation and 30

    minutes integrity .

    When subjected to full scale fire resistance tests

    to BS 476: Part 22: 1987, a system comprising

    a double layer of 50mm Rocksilk Smoke andFire Barrier, fixed by using the components and

    methods detailed on the following pages,

    achieved 61 minutes insulation, and retained its

    integrity for 66 minutes, after which time the test

    was discontinued.

    A double layer of 50mm Rocksilk Smoke and

    Fire Barrier thereby satisfies the criteria laid

    down in the Building Regulations for one hour

    cavity barriers.

    These tests incorporated vertical and horizontal

    joints between barriers. Fire resistance is

    effective from either side of the barrier. When

    tested, the wire side was exposed to the furnaceas this is the side most vulnerable to fire.

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    Fire protectionInstallation of half hour cavity barrier

    80mm

    minimum

    1. Metal angle fixed to purlin 2. Fixed to purlin 3. Fixed to rib of coffered slab

    4. F ixed across cof fered cei ling 5. Perimeter f ixing wi th s teel s tr ip 6. Junction with ceiling

    At the ceiling junction, Rocksilk Smoke and Fire

    Barrier is cut and draped on and between the

    joists, and secured by fixing to steel angle,

    which is itself fixed to the joists (Figure 6). For

    suspended ceilings, see Figure 11.At partitions or wall heads, if a secure fixing is

    available, as at soffits, Rocksilk Smoke and Fire

    Barrier should be clamped with a steel strip

    Two layers of 50mm Rocksilk Smoke and Fire

    Barrier with a 50mm air space between them

    are needed for one hour fire resistance. In

    general two separate layers should be installed

    back to back, each in a manner identical to that

    shown for half hour fire resistance. The joints in

    the two layers should be staggered and Rocksilk

    Smoke and Fire Barrier returned outward at the

    top and bottom. The wire reinforced sides

    should be placed outward, see Figure 7.

    Concrete decks

    Rocksilk Smoke and Fire Barrier is clamped

    between the deck and steel angle secured by

    expanding bolts. If the deck is coffered it should

    usually be possible to locate the cavity barrier

    along one of the ribs (Figure 3). If fitted acrossthe coffering it should be clamped by steel strip,

    to the steel angle which is secured to the ribs.

    If the depth of coffering is less than 100mm,

    Rocksilk Smoke and Fire Barrier should be

    returned at the top by 300mm, to allow for

    cutting at the ribs and pushed securely into the

    coffering (Figure 4). If the depth of coffering is

    greater than 100mm, Rocksilk Smoke and Fire

    Barrier should be fixed around the coffering

    using steel angle, as described above.

    Alternatively, proprietary profile fillers may be

    used.

    The perimeter of the barrier should be securedwith steel strip (Figure 5).

    InstallationThe following information and illustrations

    outline typical details for the installation of large

    cavity barriers. In case of uncertainty, refer to

    Knauf Insulation.

    Metal deck with overdeck insulation

    If Rocksilk Smoke and Fire Barrier runs with the

    slope of the roof, a supporting steel angle

    should be fixed between purlins and the smoke

    and fire barrier clamped to this with steel strip

    (Figure 1). The insulation should project 80mm

    beyond the strip to ensure a good seal.

    If fitted across the sheeting profile, Rocksilk

    Smoke and Fire Barrier should be bolted to the

    purlins (Figure 2). It is returned at the top, to a

    length equivalent to 3 times the profile depth, to

    allow for cutting at troughs and pushing

    securely into profiles. Alternatively, proprietary

    profile fillers may be used.

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    7. Fixed to concrete slab 8. Fixing to wall head

    10. Fixing at perimeter9. Fixing to timber spacer

    Partitions and wall heads

    If possible, Rocksilk Smoke and Fire Barrier

    should be secured with steel strip to the par tition

    or wall head so as to maintain the 50mm air

    space (Figure 8). If this is not possible, it should

    be draped with a return of at least 150mm, or

    fixed to a timber spacer which is fixed to the

    partition or wall head (Figures 6 and 9).

    Perimeter fixing

    Rocksilk Smoke and Fire Barrier should be

    secured with steel strip to the sides of the

    perimeter wall, so as to maintain the 50mm air

    space (Figure 10).

    Fire protectionInstallation of one hour cavity barrier

    Steel strip fixings: To masonry and concrete Buildex Tapcon 4H masonry anchorsTo timber Buildex HT range of fixingsTo steel angle Steel bolts

    Minimum return of Rocksilk Smoke and Fire Barrier - When clamped to flat surface (vertical or horizontal)

    80mm. When loose laid over horizontal surface - 150mm.

    Fixing system specifications

    Table 3 - Specification of angles and strips

    Angle: Mild steel - 50mm x 50mm x 2mm or 60mm x 40mm x 2mm

    Strip: Mild steel - 40mm x 2mm

    Angle fixings to concrete decks and steel sections: angles 50 x 50 x 2mm

    Fire resistance Maximum spacing of fixings (m) for the following drop heights (m)period (mins) 3 3.5 4 4.5 5 5.5 6 6.5 7

    30 2 2 2 2 2 2 2 2 2

    60 2 2 1.75 1.5 1.5 1 1 0.75 0.75

    Key: M8bolts

    M6bolts

    Angle fixings to timber beams and trusses: angles 50 x 50 x 2mm

    Fire resistance Maximum spacing of fixings (m) for the following drop heights (m)

    period (mins) 3 3.5 4 4.5 5 5.5 6 6.5 7

    30 2 2 2 2 2 2 2 2 2

    60 2 2 1.75 1.5 1.5 1 1 0 .75 0.75

    Key: Buildex HT screws, minimum 25mm thread penetration into timber

    Buildex HT screws, minimum 40mm thread penetration into timber

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    Fire protectionJointing Rocksilk Smoke and Fire barrier

    Suspended ceilings

    With suspended ceilings where positive fixing

    to wall heads or partition heads is not possible,

    the weight of Rocksilk Smoke and Fire Barrier

    and the stiffness of wire facing are such that it

    will form an effective seal if it laps the

    horizontal surface by a minimum of 150mm.

    Lapped joints are only permissible where the

    suspended ceiling has the same fire resistance

    as the cavity barrier. Rocksilk Smoke and Fire

    Barrier must be slit and fitted around any

    crossing tees to eliminate gaps and ensure that

    excessive loads are not transferred to the ceiling

    (Figure 11).

    Jointing

    This section describes the approved methods for

    joining adjacent pieces of Rocksilk Smoke and

    Fire Barrier. The methods are applicable to both

    half and one hour large cavity barriers.

    12. Ver tical butt joint 13. Ver tical returned joint 14. Ver tical lap joint

    500mmminimumoverlap

    15. Perpendicular joint 16. Horizontal joint at a drop

    Vertical and horizontal joints

    Three methods of securing the joints between

    adjacent pieces of Rocksilk Smoke and Fire

    Barrier are approved.

    Joints are tightly butted together and stitched in

    a continuous spiral loop with 1mm diameter

    galvanised lacing wire. The stitching should

    pass through the reinforcement mesh and the

    wool on each side of the butt joint at centres not

    exceeding 100mm (Figure 12).

    Alternatively the Rocksilk Smoke and Fire

    Barrier edges are returned at least 80mm and

    wired together (Figure 13), or they may be

    lapped at least 100mm and wired together

    (Figure 14).

    Perpendicular jointsThe junction between two barriers should be

    securely wired together (Figure 15) with a

    return of at least 80mm.

    Drops

    All barriers can be used for drop heights up to

    5m without additional support. For drops

    between 5m and 7m it is necessary to introduce

    additional supporting members in order to

    support the weight of the fire barriers (Figure

    16).

    Services

    Services which are permitted by Building

    Regulations to penetrate barriers, should

    be provided with collars of Rocksilk Smoke and

    Fire Barrier at least 300mm long, sewn to the

    main barrier and then strapped or wired so as

    to avoid any possibility of gaps (Figure 17).

    A half hour barrier requires a collar on

    one side of the barrier. A one hour barrier

    requires one collar on both sides of the barrier

    system.

    11. Junction with suspended ceiling

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    Penetrating steelwork

    This should be provided with a collar of Rocksilk

    Smoke and Fire Barrier at least 300mm long(Figure 18). The collar is fixed to the concrete or

    metal deck by clamping against these surfaces

    behind steel angle. The voids in the steelwork

    are filled with Rocksilk Smoke and Fire Barrier

    (figure 18). A half hour barrier requires a collar

    on one side of the barrier. A one hour barrier

    requires one collar on both of the layers of the

    barrier system.

    Access

    Where permanent access is needed through the

    barrier, a fire door and frame, rated to the

    appropriate fire resistance, must be used.

    Rocksilk Smoke and Fire Barrier should be fixed

    securely to the frame.

    300mm

    minimum

    17. Penetrating pipe

    19. Temporary framework to ease handling

    18. Penetrating steelwork

    Handling

    Depending on the size of the barrier and the

    working space available, it is sometimes difficultto hold the material in place while top fixings

    are being secured. It will be found helpful to

    make a temporary prop from, e.g. slotted

    angle. This may comprise a crosspiece of length

    appropriate to the width of the Rocksilk Smoke

    and Fire Barrier, with studs on the top which will

    hook into the wire mesh of the Rocksilk Smoke

    and Fire Barrier. This may be swivelled on the

    top of a handle, and secured horizontally or to

    the angle of the roof by an adjustable brace. It

    is used to hold the Rocksilk Smoke and Fire

    Barrier up, 100mm or so behind the fixing

    location, while fixing is being carried out.

    When fixing to a sloping deck, the top of theRocksilk Smoke and Fire Barrier should be

    trimmed to the correct angle to ensure that joints

    are truly vertical (Figure 19).

    Following trades

    The integrity of barriers must be restored if

    disturbed by following trades, either duringthe building process or after completion.

    This instruction should be incorporated into

    the building handbook.

    Fire protectionPenetrating pipes and ducts

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    Internal floorRefurbishment of timber separating/internal floor

    Earthwool Flexible Slab

    Minimum 18mm ChipboardEarthwool Flexible Slab

    Support meshstapled to joists

    Existing ceiling

    Existing ceiling can beretained, avoiding disruptionto rooms below

    Provides thermal and acousticinsulation as well as fireresistance

    Meets the requirements ofApproved Document E for soundresistance of internal floors

    Earthwool Flexible Slab

    Non-combustible with a Euroclass A1reaction to fire rating

    A+ Generic BRE Green Guide rating

    Zero Ozone Depletion Potential (ODP)

    Zero Global Warming Potential (GWP)

    Installation

    After removal of the floor deck, line the voids in

    the floor with 25mm wire mesh, to form a

    support tray for the insulation. Staple the wire

    mesh to the sides of the joists, at least 40mm up

    from ceiling level.

    Cut 100mm Earthwool Flexible Slabs to size

    and lay onto the wire mesh support, so that

    there are no gaps between the insulation andthe joists. Butt joint the insulation slabs so there

    are no gaps between them.

    Fix a chipboard floor deck, at least 18mm thick,

    over the entire floor area.

    Typical construction

    The use of Earthwool Flexible Slab in a

    suspended timber floor achieves one hour fire

    resistance, whilst allowing the existing ceiling to

    be retained.

    To achieve one hours fire resistance:

    The floor deck should be at least 18mm thick

    tongued and grooved chipboard or timber

    boarding The joists must be at least 200mm deep and

    37mm wide

    The wire mesh should be stapled to the sides

    of the joists at least 40mm above the ceiling

    level

    Any ceiling can be used

    ProductsEarthwool Flexible Slabis a multi-purpose rock

    mineral wool slab designed to be friction fitted

    in a wide range of acoustic, thermal and fire

    resistant applications.

    Introduction

    Where the loft space of a two storey house is

    converted into habitable accommodation, the

    floor to the new rooms must have 30 minutesfire resistance over any part of the escape route

    directly below. This is often the case when, for

    example, the floor of the new room extends

    over a landing in the stairway enclosure below.

    The solution on this page provides the required

    period of fire protection without having to

    upgrade the existing ceiling.

    Fp06REFURB

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    Typical specificationLay 100mm Earthwool Flexible Slab on

    25mm chicken wire mesh, stapled to sides of

    joists at least 40mm up from ceiling level and

    at 600mm centres. The joists should be at

    least 200 x 37mm and spaced at not more

    than 600mm centres. The flooring board to

    be at least 18mm thick.

    Alternatively, consult the National

    Building Specifications, Standardversion clause/clauses

    P10/250

    Knauf Insulation specification clauses can be

    downloaded from knaufinsulation.co.uk/nbs

    Performance

    Fire performance

    Earthwool Flexible Slab is classified as

    Euroclass A1 to BS EN 13501-1 and non-

    combustible to BS 476: Part 4: 1970

    (1984), Class 1 Surface Spread of Flame to BS

    476: Part 7: 1997 and Class 0 to the Building

    Regulations.

    Acoustic

    The acoustic performance of an internal floor

    containing 100mm of Earthwool Flexible Slab

    (and 12.50mm standard plasterboard ceiling)

    will be at least 40dB and therefore, meet the

    requirements of Approved Document E of the

    Building Regulations.

    Existing wall

    Minimum 18mm chipboard

    EarthwoolFlexible Slab

    Wire mesh stapled to joists to providesupport for Earthwool Flexible Slab

    Existing ceiling

    Earthwool Flexible Slab cut and frictionfitted between last joist and wall

    Typical wall floor junction

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    Lightweight, mineral wool has

    approximately one half to one third of

    the weight of traditional silicate and

    vermiculite boards

    Fast and simple fixing system makes the

    slabs quick and easy to install

    Provides excellent acoustic and thermal

    performance insulation

    Rocksilk Pyroduct Slab

    Non-combustible with a Euroclass A1

    reaction to fire rating

    Zero Ozone Depletion Potential (ODP)

    Zero Global Warming Potential (GWP)

    ProductRocksilk PyroDuct Slabis a 160 kg/m3density

    rock mineral wool slab. The slabs are faced

    with a bright Class O reinforced aluminium

    foil, making it suitable for applications above

    clean rooms, within air plenums or for aesthetic

    purposes.

    Typical construction

    The exposed surfaces of steel ductwork are fullyenclosed in Rocksilk PyroDuct Slab using the

    fixing system shown on the following pages.

    Rocksilk PyroDuct Slab can be used to provide

    up to 2 hours fire protection to steel ductwork.

    InstallationRocksilk PyroDuct Slab is applied in a single

    thickness, removing the need for multi layer

    applications. This provides assurance of a

    uniform thickness and therefore the integrity of

    the system and allows for easy verification of

    correct installation on site.

    Individual slabs are 1200mm long and 600mm

    wide making them easy to carry around site.Their lightweight nature also makes them easy

    to use.The fixing system of welded pins and

    square edge butt jointsgives a fast and simple

    system which requires no special vee cuts,

    drilling or sub-frames and also makes the slabs

    fast and easy to install.

    PerformanceFire

    Rocksilk PyroDuct Slab is classified as

    non-combustible to BS 476: Part 4: 1970

    (1984), Class 1 surface spread of flame to BS

    476: Part 7:1997 and Class O to the Building

    Regulations.

    Rocksilk PyroDuct Slab has been tested in

    accordance with BS 476: 24:1987 and canprovide up to two hours fire resistance for steel

    ductwork exposed to fire either inside or outside

    of the duct.

    Moisture resistance

    Rocksilk PyroDuct Slab is non-wicking when

    tested to BS 2972: 1989: Section 12. When

    exposed to 90% relative humidity and 20C,

    Rocksilk PyroDuct Slab absorbs less than

    0.004% of moisture.

    Fire protectionSteel Duct Encasement

    Rocksilk Pyroduct SlabNEW BUILD REFURB

    Fp07 Blockwork compartmentwall

    RS33 Slab as packing

    Steel angle rivetted at 150mm centres

    Rocksilk Pyroduct fixed to duct

    Rocksilk Pyroduct glued to wall and insulation

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    Typical specificationRocksilk PyroDuct Slab...........mm thick to be

    used to provide up to 2 hours fire protection

    to steel ductwork as detailed in this schedule

    (specifier to state which ducts require fire

    protection).

    It is to be installed using the fixing system as

    detailed, and at a thickness with due regard

    to the duct size, orientation and period of fire

    protection required.

    Table 4 - Required thickness of Rocksilk PyroDuct Slab

    Thickness of insulation (mm)

    Period of fireresistance (hours)

    Vertical ducts Horizontal ducts Kitchen extractducts

    0.5 - - 45

    1.0 45 45 90

    2.0 90 90 -

    Table 5 -Weight of slabs

    Thickness(mm)

    Weight(kg/m2)

    45 7.20

    90 14.40

    WeightTable 5 shows the weight per square metre of

    Rocksilk PyroDuct Slab.

    Fire protection

    Any vertical or horizontal, rectangular or

    square steel ductwork associated with

    ventilation and/or air conditioning systems,

    including ducted supply and extract systems

    (whether through ducts or plenums),

    mechanically assisted systems and those

    relying on natural convection can be

    protected with Rocksilk PyroDuct Slabs to

    provide the required degree of fire protection.

    Achieving the required fireperformance

    The required thickness of Rocksilk PyroDuct

    Slab depends upon the orientation of the duct

    and the period of fire resistance required.

    Table 4 displays the thicknesses required for

    vertical and horizontal ducts and also for

    kitchen extract ducts for the commonest

    periods of fire resistance.

    Foil facing omitted for clarity

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    Fire protectionSteel Duct Encasement

    350m

    m

    X

    Y

    Greater

    than

    1000mm

    350m

    m

    50mm

    500mm

    max

    350m

    m50mm

    500mm

    max

    1. Weld 3mm diameter steel pins at 350mm longitudinal centres

    along the centre line of the vertical sides of the ductwork.

    2. Where the dimension of the vertical sides exceed 1000mm,

    the steel pins should be in rows starting 50mm in from the edge

    and spaced apart at a maximum of 500mm centres.

    3. Weld 3mm diameter steel pins at 350mm longitudinal centres

    along the horizontal surfaces of the ductwork in rows starting

    50mm in from the longitudinal edge and spaced apart at a

    maximum of 500mm centres.

    4. Cut Rocksilk PyroDuct Slab to size as follows:

    horizontal surfaces to dimension X,

    vertical surfaces to dimension Y + 2t,

    where t = thickness of insulation.

    5. Attach the insulation by impaling over the welded pins and

    securing with 38mm spring steel washers.

    6. Glue all board to board joints using a thixotropic silicate

    based adhesive.7. Trim off pin lengths to about 30mm excess and bend this

    excess to form a right angle with the insulation.

    8. Although not essential, it is good practice to offset the joints

    for each surface.

    6

    7

    8

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    Fire protectionSteel Duct Encasement

    Vertical ducts

    The installation detail on the previous pages for horizontal ducts is

    also relevant for vertical ductwork, though the horizontal and vertical

    surfaces referred to for horizontal ductwork will be the longest and

    shortest surfaces respectively in vertical ductwork.

    Ductwork passing through compartment

    walls or floors

    In accordance with The Building Regulations, when ductwork passesthrough any element of construction which has a designated period

    of fire resistance, the integrity of that compartment should be

    maintained. In these situations, the ductwork in the immediate vicinity

    of the penetration should be stiffened as follows:

    a) When the flange is within 100mm of the penetration then a50 x 50 x 3mm steel angle should be rivetted to the top edge

    of the duct using a single row of rivets with washers starting50mm from the edge and at 150mm centres.

    Earthwool Building Slab RS33 should be used to pack any gapbetween the main insulation and the blockwork.

    120 x 90mm sections of Rocksilk Pyroduct Slab is glued to thewall and main Pyroduct insulation.

    b) When the flange is greater than 100mm from the penetration,two angles should be used, fixed as described in a) above, and45mm Rocksilk Pyroduct Slab installed perpendicular to the ductat the penetration.

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